I'm not sure if this question really qualifies as a "reference recommendation" in the sense discussed at the meta post @e-sushi linked to. Even if it does, though, rephrasing it e.g. as "How can I test the effectiveness of my new image steganalysis technique on realistic data?" should make it on topic here.
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Ilmari KaronenDec 14 '13 at 14:19

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@Layla: I just tried to do that myself, but feel free to change anything you want (especially if you feel I introduced any inaccuracies). It's your question, after all.
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Ilmari KaronenDec 14 '13 at 14:28

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Testing a new CSPRNG's output with existing randomness tests is next to pointless in order to show the goodness of the CSPRNG (tests can only detect some very bad CSPRNG, and some implementation errors). Similarly, testing a steganalysis technique with existing test data (not designed with knowledge of the steganalysis technique) will not be a good demonstration of the virtues of the new techniques.
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fgrieuDec 14 '13 at 14:59

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Your best bet would be to look for steganographic systems that are out there (either software or a paper describing it). Implement those systems and see how your steganalysis method works. Then you can implement other steganalysis methods from the literature and compare how well yours does vs those.